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Windows 7: Mobility 5850 - 3D games freezing, with brightness stuck

Since last Monday, my laptop's been through its fourth at Knowhow's facilities. I was anxious to play games like Euro Truck Simulator 2 and Gmod again, but after a minute or two of gameplay, they would both freeze. From there the screen would turn black, turn back on at full brightness, and allow me to play for a few seconds before looping the process again. The only way I could stop this was by 'Alt-F4'-ing my way out of the game, which would allow me to change my brightness.

At first, I tried updating the drivers as that could have helped, though, instead, made no difference. From there, I proceeded to do an 'express' uninstall of the drivers and anything else associated, restarted, installed the driver only, and restarted again. No success. I even tried Red Faction: Guerilla, only to be met with the same results. Weirdly, though, 2D games like Hexcells, Prison Architect and Speedrunners run flawlessly!

Each time I tried, the audio would go on for a few seconds after freezing, before stuttering itself. I've tried switching back to onboard audio - I use the Xonar U3 as my sound card - but to no avail. Heat and fans, however, just ramp up after a minute or two like they've always done.

I have managed to compile a dump 'zip' file with what I found from the Reliability Monitor, so that may help matters a bit.

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